Well, the Hijri date 11 Rabi Al Thani 1280 corresponds to the Gregorian date Thursday, 24 September 1863. This date lies in the fourth month of the Hijri year 1280 AH, which is Rabi Al-Thani of 1280 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1280/04/11 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 24 September 1863 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rabi Al Thani 1280 AH to its equivalent Gregorian date.
وَيَوْمَ تَقُومُ ٱلسَّاعَةُ يُبْلِسُ ٱلْمُجْرِمُونَ
And in the day when the Hour riseth the unrighteous will despair.
Surah Ar-Room(30:12)